The incidents, the first of which was reported on Thursday, came as election officials have reported a growing number of threats directed at them.

Plus, Katie Zacharia’s ouster, A.O.C. on the trail, and another tense debate in Maine.

Both Senator Susan Collins, a Republican, and Troy Jackson, her Democratic challenger, grew up in Aroostook County, a vast, isolated northern wilderness. Those roots have helped define them.

This quarter’s campaign finance report shows that the world’s richest man is the top political donor of this midterm election. Our reporter Theodore Schleifer explains how Elon Musk came back from a brief rift with President Trump and Republicans to become a central player in the party’s campaign to hold Congress.

Republican Senate and House candidates are being out-raised by their Democratic rivals, but the party has received a huge boost from groups tied to Elon Musk and President Trump.

Republicans have used A.I.-generated content more often than Democrats, ranging from subtle enhancements to convincing deepfakes.

The Republican incumbent, Dan Sullivan, and his Democratic challenger, Mary Peltola, veered from serious discussion of high prices and economic challenges to blistering personal attacks.

The world’s richest person, who has become the biggest known midterm donor, gave $158 million to a group that quickly spent that much to help Mr. Paxton’s Senate bid in Texas.